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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd7e8eb232f75661b08f8cea3806dd150238c381eda007620cdc5a7462a81564' 
  AND token = 'zZjo90D/+yBgRlcR1DG3O21lFKy7aFWEY8pJpli7qNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}